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D.GESTETNER. APPARATUS EMPLOYED IN PRINTING FROM STENGILS.

PatentedApr[Z,1895

No.536fl20.

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D. GESTETNER. APPARATUS EMPLOYED IN PRINTING PROM STENGILS. No. 536,720.

Patented Apr. 2, 18%

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APPARATUS EMPLOYED IN PRINTING FROM'STENGILS.

Patented Apr. 2, 1895.

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APPARATUS EMPLOYED IN PRINTING FROM STENGILS.

v No. 536,720. Patented Apr. 2,1895.

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A D-.GESTETNER. APPARATUS EMPLOYED IN PRINTING FROM STENGILS.

No. 536,720. PatentedApr. 2, 1895.

IIII/IIIIIIIIIIIIIIIIII/IIMIMIMMIIII/II/I/III/Mlm r 41 mil/ 1111111 UNITED STATES PATENT ()FFICE.

DAVID GESTETN ER, OF LONDON, ENGLAND.

APPARATUS EMPLOYED IN PRINTING FROM STENCILS.

SPECIFICATION forming part of Letters Patent No. 536,720, dated April 2, 1895. Application filed March 17, 1893. $erial No. 466,429- (No model.) Patented in England October 1, 1892, No. 19,438.

To all whom it may concern.-

Be it known that I, DAVID GESTETNER, a subject of the Queen of Great Britain, and a resident of London, England, have invented a certain new and useful Improvement in Stencil-Printing Apparatus, (for which I have obtained a patent in Great Britain,No.19,438,

' bearing date October 1, 1892,) of which the following is a full, clear, and exact description.

This invention relates to an improvement in stencil printing apparatus.

The invention has for its object the combination with a paper stencil stretching and printing frame, of means for passing the said frame to and fro under a printing roller, of means for automatically lowering such printing roller on to the stencil for printing and for raising the said roller ofi the stencil after the printing has been effected, of means for supplying and properly distributing the ink to such printing roller, of means for automatically raising the stencil stretching frame and stencil above the printing table to enable-a sheet of paper to be laid on such table for printing and to enable a printed sheet to be removed therefrom, of means for automatically pushing or throwing off the printed sheet from the printing table, of means for enabling the printing table and stencil stretching frame to be readily removed outof action, and of means for enabling the inking and printing rollers to be placed in contact with each other for the purpose of effectually distributing a fresh supply of ink before allowing the stencil stretching and printing frame to pass in contact with the printing roller.

In order that my said invention may be clearly understood and readily carried into effect, I will proceed, aided by the accompanying drawings, fully to describe the same.

Figure 1, is a plan, Fig. 2, is a side view, and Fig. 3, is an end View of a stencil printing apparatus constructed according to my invention. Fig. 4., is a side elevation of parts showing some of the parts in section and some in a different position from'that shown in Fig. 2. Fig. 5, is a plan of the printing roller and of its lever frame separately. Fig. 6, is a horizontal section drawn on the line, 1, 1, of Fig. 2. Fig. 7, is an internal view of thegear standard showing some parts in section. Fig. 8, is a sectional elevation of the parts carrying the ink In all the figures like parts are indicated by similar letters of reference. 7

a is the stencil stretching and printing frame, which is generally constructed in the manner well understood, but with the additions or alterations hereinafter referred to.

In carrying my invention into efiect I give a to and fro motion to the frame a, for which purpose it is mounted on a table '1) and is suitably guided to enable the same to work smoothly to and fro thereon, as hereinafter described.

The frame a, as shown in thedrawings, has two dowel holes a. formed in one side of its base a. to pass on to two dowel holes 0 fixed in a slide or frame 0 carrying a toothed rack c and a cam surface 0 having switches 0 c for the purpose hereinafter referred to. This slide or frame a is formed with one edge square and the other beveled to work between correspondingly formed guides 19 b fixed on the table I), but it may be otherwise guided. The side of the frame a opposite to that connected with the-slide or frame 0, is supported on a smooth rail b fixed along that side of the table I). By this means the frame a is guided so as to be enabled to move smoothly to and fro on thetable Z).

It will be evident that instead of removably connecting the frame a. with the slide or frame 0, rack c and cam 0 c 0 it may have the rack c and cam 0 c c permanently fixed thereto, but this latter arrangement is not so satisfactory as that previously described.

To the sides of one end of the table 6 are fixed standards at d, in which are formed bearings for the axles or trunnions e of the frame or cross bar e, the arms or levers e of which carry the inking roller e. In each of the standards d cl arefixed cross bars or rods ff, on which slides the bar or frame gcarrysprings acts on a projection e from one of the arms or levers e while the other ends thereof are capable of being placed in one or other of the series of catches d on each of the standards cl d to regulate the strength of such springs, which latter are for the purpose of pressing the printing roller 6 firmly on to the stencil when printing. The springs e may howeverbe dispensed with and the printing roller may be pressed onto the stencil simply by its own weight or by other suitable means.

The standard 01 carries the axle h of a toothed wheel h gearing into the rack 0 an axlet' having an operating handle (not shown) mounted thereon, a toothed wheel 2" on the axle t' gearing into the toothed wheel h, the axle of atoothed wheelj gearing into atoothed wheel 70 on the axle of the inking roller 70, and an axis Z carrying a double armed lever Z havingastud Z at the free end of the arm P, which Works in connection with the before mentioned switched cam surface 0 while the arm Z acts on the under side of a projection e on one of the arms 6 of the printing roller frame e to raise said frame when required, for which purpose the stud Z is acted upon automatically by the cam surface 0 c 0 when the apparatus is being used for printing. The standard (1 also carries the axis of a hinged cam lever m and a stop m acting with such cam lever, which latter acts in connection with a stud or projection a on the stencil stretching frame of, so that in the motion, in the direction of the arrow Fig. 4:, of the stencil stretching and printing frame a, the stud a. will run up said cam lever m and raise the frame 0 while in the motion in the contrary direction, indicated by the arrow in Fig. 2, when inserting the frame a into position, the stud a will freely pass said cam lever m, merely turning the latter somewhat on its axis. The standard d is also provided with an axis n carryinga lever a, one end of which is in position to act upon a stud Z carried by the arm Z of the lever Z, while the other end of suchlevern has a thumb piece 71 by means of which the printing roller 6 can, when desired, be raised by hand into contact with the inking roller 7a or be permitted to fall away therefrom. This lever 01 is employed when it is desired to insure a proper supply of ink to the printing roller e previous to placing the stencil stretching and printing frame a in position in the apparatus, in which case the thumb piece a of the lever 72 can be so far depressed as to enable that end of the lever n to be passed underneath the stop or catch 01 on the standard at, by which means the printing roller 6 can be retained in contact with the inking roller when, by means of the operating handle (not shown), rotary motion can be given to the axle 11, which, by the gear wheels 2",j and It, will communicate rotary motion to the inking rollerlc and, through contact therewith, to the printing roller 6.

The inking roller 70 has on one end thereof,

a cam groove 70 in the form of two screw threads crossing each other and joining at their ends, in combination with which acts a swiveling projection 9 carried by the bar g of the distributing or waver roller 9 to give a to and fro motion to the latter. The ink distributing or waver roller g is mounted in a frame 9 centered in the arms g of the bar or frame 9 to enable the roller 9 to be separated from the roller 70 when the apparatus is at rest, which separation is effected by acting upon the frame g by hand or by a projection from a cover (not shown) which is placed over the apparatus when the latter is not in use. The printing roller 6 also, automatically, falls out of contact with the inking roller is when the stencil stretching and printing frame a is drawn out against the spring stop 12 with the frame a in its lowered position when the apparatus is out of use and is to be put away with its cover on.

A stop 0 fixed to the rack o acts to limit the motion of the frames at and c to the rear by traveling to the inner end of the groove d in the frame d, while a spring stop b acts to limit the forward motion of such frames. By depressing the stop 71 the frames at and 0 can be readily removed from the rest of the apparatus.

The lever n is provided with a stud stop it which passes through a curved slot d of the frame or standard d, so that when the frames at and c are removed out of their working positions with the rack c to the left of the stop p and the lever n is held in its depressed position, the frame a cannot be passed underneath the printing roller e until, by raising the lever 71., the stop a is removed out of the way of the rack c and the roller e is liberated, so as to render it capable of printmg.

The action of the apparatus is as follows: Supposing a sheet of paper to be printed upon has been placed in position below the stencil, the axle 2' is rotated. The gearing is thereby set in motion so as to pass the stencil stretching and printing frame a underneath the printing roller 6 for printing. In the motion of such frame a in such direction, the printing roller 6 is at first raised by the right end of the cam surface a then the switch 0 by enabling the projection Z of the lever Zto pass below the cam surface 0 permits the printing roller 6 to fall on to the stencil, where it continues to act until the projection Z of the lever Z reaches the left end of the cam 0 when it will pass from underneath such cam past the switch 0 Then,on reversing the motion of the gearing, the frame a will be caused to travel to the left, the projection Z will rise up the outside of the switch a and will then travel on the upper side of the cam c and switch 0 and in such position the lever Z will raise the printing roller e from off the stencil and carry it against the inking roller 70 to receive a fresh supply of ink. The other parts of the apparatus will act as hereinbefore described to distribute the ink, to raise and lower the stencil stretching frame, and to eject the printed sheet. A fresh sheet of paper is then placed on the printing table when the operations will be repeated.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

In stencil-printing apparatus having a movable stencil-carrying frame, a printing-roller, an inking-roller and an ink-distributing roller operated as herein described, the combination therewith of means whereby, when.it is desired to supply and distribute the ink to the printing roller previous to placing the stencil carrying frame in action, the printing DAVID GESTETNER.

Witnesses:

S. N. TYRRELL, WALTER E. ROCHE. 

